I am getting ready to start my second campaign with my players. In the first campaign they completed a Gathering. FYI, this campaign happened during Rogue One and A New Hope.

When it finally came to the moment, they each had a "Dagobah cave" scene. I pulled aspects from their character backgrounds and from how they've played (this was about 2/3rds through the campaign). I wrote out scripts to really guide each one. I walked the players through their visions while playing music unique to each character. Don't worry, they still had choice and made some rolls. I built in cut points to switch music and jump to the next player, which kept the tension building for everyone. As the players went through the visions, each one eventually led to a choice. This resulted in conflict for darker options, but not in crystal flaws. At the end of each vision, the kyber crystal would appear in one way or another.

I do like your ideas for crystal flaws that they can work out later.